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Megger TTR20-1 Transformer turns ratio tester
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Brand:
Megger
Type of Power :
Six standard “AA” (IEC LR-6) alkaline batteries
Battery Life :
12 hours of field operation
Excitation Voltage :
8 V rms for testing distribution or power transformers and PTs, 0.5, 1.5, or 8 V ac rms for testing CTs.The excitation voltage is switched automatically if excitation current exceeds a preset value.
Test Frequency :
55 Hz internally generated providing a universal 50/60 Hz test set
Excitation Current Range :
0 to 100 mA, 4-digit resolution
Turns Ratio Range :
0.8 to 10,000, 5 digit resolution
Transformer Polarity :
Normal or reversed
Current (rms) accuracy :
(2% of reading + 1 digit)
Turns Ratio Accuracy :
0.1% (0.8 to 2000), 0.15% (2001 to 4000), 0.25% (4001 to 10,000)
Display full graphics :
LCD module, adjustable back-lighting, wide temperature range, 128 x 64 dots (21 characters by 8 lines)
Transformer Winding Phase Relationship :
ANSI C57.12.70-1978
Safety/EMC/Vibration :
Meets the requirements of IEC-1010-1, CE and ASTM D999.75
Temperature Range :
Operating: -20º C to 55º C (-5º F to 130º F), Storage: -50º C to 60º C (-55º F to 140º F)
Relative humidity :
0 to 90% noncondensing
Protective Devices :
High voltage side shorting relay, transient voltage suppressors and gas surge voltage protectors
Measuring Time :
Less than 5 seconds
Measurement Method :
ANSI/IEEE C57.12.90
Dimensions:
240 H x 115 W x 50 D mm (9.5 H x 4.5 W x 1.9 D in.)
Weight:
Approximately 1.3 kg (2.8 lb), including leads
Megger TTR20-1
The Megger TTR20-1 is a versatile, handheld, battery-operated transformer turns ratio (TTR) tester. It’s designed to measure the turns ratio, excitation current, and polarity of windings in single- and three-phase distribution and power transformers, as well as potential and current transformers (PTs and CTs), and tapped transformers12.
Key Features
- Automatic Operation: The TTR20-1 is fully automatic, simplifying the testing process.
- Handheld and Lightweight: Weighing just 870 grams (1.9 lbs), it’s easy to carry and operate, even in challenging environments1.
- Battery-Powered: Operates on standard AA batteries, making it convenient for field use1.
- One-Button Operation: Designed for simplicity, it allows for quick and easy testing with minimal setup1.
- High Accuracy: Measures a high turns ratio of up to 10,000:1 with excellent repeatability1.
- Robust Design: Built to withstand harsh conditions with a high-impact, shock-resistant case1.
- Clear Display: Features a high-contrast, backlit LCD screen that is easy to read in various lighting conditions1.
Applications
The TTR20-1 is particularly suited for:
- Substations: Ideal for testing transformers in substations.
- Transformer Manufacturing: Useful in manufacturing environments for quality control.
- Meter Shops: Helps in verifying the accuracy of PTs and CTs12.
The device applies voltage to the high voltage winding of a transformer and measures the resulting voltage from the low voltage winding. The ratio of these voltages is directly proportional to the turns ratio. This helps in identifying issues in transformer windings or magnetic core circuits12.
Overall, the Megger TTR20-1 is a reliable and efficient tool for anyone involved in transformer testing, offering ease of use, portability, and precise measurements.
Megger TTR20-1 Specifications
| Type of Power | Six standard “AA” (IEC LR-6) alkaline batteries |
| Battery Life | 12 hours of field operation |
| Excitation Voltage | 8 V rms for testing distribution or power transformers and PTs |
| 0.5, 1.5, or 8 V ac rms for testing CTs. | |
| The excitation voltage is switched automatically if excitation current exceeds a preset value. | |
| Test Frequency | 55 Hz internally generated providing a universal 50/60 Hz test set |
| Excitation Current Range | 0 to 100 mA, 4-digit resolution |
| Turns Ratio Range | 0.8 to 10,000, 5 digit resolution |
| Transformer Polarity | Normal or reversed |
| Current (rms) accuracy | (2% of reading + 1 digit) |
| Turns Ratio Accuracy | 0.1% (0.8 to 2000) |
| 0.15% (2001 to 4000) | |
| 0.25% (4001 to 10,000) | |
| Display full graphics | LCD module |
| adjustable back-lighting | |
| wide temperature range | |
| 128 x 64 dots (21 characters by 8 lines) | |
| Transformer Winding Phase Relationship | ANSI C57.12.70-1978 |
| Safety/EMC/Vibration | Meets the requirements of IEC-1010-1, CE and ASTM D999.75 |
| Temperature Range | Operating: -20º C to 55º C (-5º F to 130º F) |
| Storage: -50º C to 60º C (-55º F to 140º F) | |
| Relative humidity | Operating: 0 to 90% noncondensing |
| Storage: 0 to 95% noncondensing | |
| Protective Devices | High voltage side shorting relay, transient voltage suppressors and gas surge voltage protectors |
| Measuring Time | Less than 5 seconds |
| Measurement Method | ANSI/IEEE C57.12.90 |
| Dimensions | 240 H x 115 W x 50 D mm |
| (9.5 H x 4.5 W x 1.9 D in.) | |
| Weight | Approximately 1.3 kg (2.8 lb), including leads |
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Megger TTR20-1 Transformer turns ratio tester
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